Droid Eris randomly calling last person dialed?General

I've been trying to pinpoint what exactly is causing this issue, but my Droid Eris has recently randomly called my last dialed person a few times. Sometimes randomly while in Pandora, other times while just browsing the web. It never happens when I'm not using the phone, and it's not very frequent. Just wondering if anyone else has experienced this, and if it's an app, the 1.5 OS, or what?